We may know why younger brothers are more likely to be gay | New Scientist

Contents:

• MEN WH OLR BROTHERS ARE MORE LIKELY TO BE GAY, STUDY SUGGTS
• ARE YOUNGER BROTHERS MORE LIKELY TO BE GAY?
• WE MAY KNOW WHY YOUNGER BROTHERS ARE MORE LIKELY TO BE GAY
• BOYS WH OLR BROTHERS MORE LIKELY TO BE GAY, STUDY SAYS
• HERE IS WHY HAVG OLR BROTHERS CREAS YOUR CHANC OF BEG GAY
• HAVG OLR BROTHERS INCREAS A MAN'S ODDS OF BEG GAY
• MEN WH OLR BROTHERS MORE LIKELY TO BE GAY
• JAGUARS ASSOCIATE STRENGTH ACH OUT AS GAY A FIRST FOR US-BASED PRO LEAGU
• STUDY SUGGTS MAL WH OLR BROTHER MORE LIKELY TO BE GAY
• DO HAVG OLR BROTHERS INCREASE MEN’S CHANC OF BEG GAY? HERE’S WHAT THE STUDI SAY

MEN WH OLR BROTHERS ARE MORE LIKELY TO BE GAY, STUDY SUGGTS

Men wh olr brothers are more likely to be gay, acrdg to a study published Wednday the journal Proceedgs of the Royal Society B.

ARE YOUNGER BROTHERS MORE LIKELY TO BE GAY?

This new report builds upon prev rearch regardg male birth orr and homosexualy, though there is still no cisive ncln as to why there’s a lk between the cross-analyzg data om 10 scientific studi wh more than 5, 000 subjects, rearchers found that men wh olr brothers were 38 percent more likely to intify as gay. ”The study, which pared the probabily of the youngt brother a two-son fay beg gay as pared to the olst son, did not clu female subjects, as prev rearch has tablished that women do not fluence the sexual orientatn of their younger siblgs, acrdg to this study did not terme a ncrete reason for the rrelatn between a man havg an olr brother and intifyg as gay, Blanchard said that “pots toward the need for more rearch on the 'maternal immune hypothis'” — a theory Blanchard troduced 1996 that suggts that a mother is exposed to “male-specific substanc” durg pregnancy wh or the birth of a son. Acrdg to proponents of the theory, the mother’s immune rponse is changed durg the pregnancy of a boy, creasg the likelihood that a subsequent male child would be gay.

In 1996, the psychologists Ray Blanchard and Anthony Bogaert published a paper ntendg that homosexualy was more mon men who had olr brothers.

WE MAY KNOW WHY YOUNGER BROTHERS ARE MORE LIKELY TO BE GAY

"In [Wtern] societi, homosexual men are femized at var levels and they have more olr brothers than heterosexual men, " state the thors of the study. "To evaluate whether femy and the aternal birth orr effect are universal featur of male homosexual preference or not, we llected origal data om homosexual men, heterosexual men, and heterosexual women om Java (Indonia).

The rearchers examed data om 116 homosexual men and 62 heterosexual men om wtern and central Java.

Consistent wh Blanchard and Bogaert's fdgs Wtern societi, they found that homosexual men were more likely to have olr brothers than heterosexual men. To be specific, homosexual men their sample had an average of 0.

BOYS WH OLR BROTHERS MORE LIKELY TO BE GAY, STUDY SAYS

Intertgly, the rearchers also found that homosexual men were more likely to have olr sisters, although this difference was smaller than the olr brother difference. The rearchers then tted whether homosexualy was visible the facial featur of Indonians. Usg standardized photographs of heterosexual and homosexual Indonian men, the rearchers found that men wh olr brothers were perceived to have more feme facial featur than men whout olr brothers.

They did not, however, fd that homosexual men were any more femized their facial featur than heterosexual men.

The thors wre, "Taken together, the rults suggt the prence of a femizg factor associated wh male homosexualy that is partially termed by male birth orr. Homosexualy has been a long-standg pot of nfn for evolutnary psychologists. Male Homosexual Preference: Femy and the Olr Brother Effect Indonia.

HERE IS WHY HAVG OLR BROTHERS CREAS YOUR CHANC OF BEG GAY

In the first-ever laboratory study of mothers of gay men, the rearch was prompted by more than two s of statistil data examg the 'olr brother effect' which shows that blogil olr brothers—but not olr sisters—crease the odds of homosexualy later-born mal. The study, "Male Homosexualy and Maternal Immune Rponsivy to the Y-Lked Prote NLGN4Y, " was published Monday, Dec. The current study adds to the growg scientific nsens that homosexualy is not a choice, but rather an nate predisposn.

HAVG OLR BROTHERS INCREAS A MAN'S ODDS OF BEG GAY

The team of psychologists and immunologists tted 16 women wh no sons, 72 mothers wh heterosexual sons, 31 mothers of gay sons wh no olr brothers, 23 mothers of gay sons wh olr brothers, and a ntrol group of 12 men.

The team found that mothers of gay sons, pecially those wh olr brothers, had signifintly higher antibody levels to both forms of NLGN4Y than did the ntrol sampl of women, cludg mothers of heterosexual sons. However, the psychologist utns that the effects are most and the likelihood of a male child beg born gay is still small—even if they have multiple male siblgs. Male homosexualy and maternal immune rponsivy to the Y-lked prote NLGN4Y, Proceedgs of the Natnal Amy of Scienc (2017).

Study nfirms lk between the number of olr brothers and creased odds of beg homosexual (2017, December 12). The more olr brothers a boy has, the more likely he is to be gay when he grows up – an effect lled the “aternal birth orr effect”.

MEN WH OLR BROTHERS MORE LIKELY TO BE GAY

They found that the mothers of gay sons wh olr brothers had the hight levels of antibodi agast this prote, followed by the mothers of gay sons wh no olr brothers.

“Given that the prote is known to be important synapse formatn, you n see how maternal antibodi might affect the wirg of the fetal bra, and that might expla why each subsequent son is more likely to grow up gay. “The signifince of this prelimary observatn, if n be replited, is that intifi specific molecul the bra that may be important for heterosexual as well as homosexual velopment, ” says Dean Hamer, a pneer of rearchg the blogil termants of sexual orientatn. Read more: What do the new gay gen tell about sexual orientatn?

New rearch found that havg an olr brother creas men’s chanc of beg gay, acrdg to a study published Wednday the journal Proceedgs of the Royal Society B. The fdgs om German and Canadian scholars showed that men wh olr brothers have a 38% higher likelihood of beg homosexual than men who don’t have an olr brother. “[Olr] brothers crease the probabily of homosexualy later-born mal, ” read the study’s abstract.

JAGUARS ASSOCIATE STRENGTH ACH OUT AS GAY A FIRST FOR US-BASED PRO LEAGU

The fdgs also showed that the more olr brothers a man had, the higher the likelihood he would be gay. Havg three olr brothers doubled a man’s chanc of beg gay, acrdg to the rearch. The study also found a rrelatn between mothers givg birth to homosexual mal and havg more children, as pared to moms of straight mal havg fewer children.

STUDY SUGGTS MAL WH OLR BROTHER MORE LIKELY TO BE GAY

“[Mothers] of homosexual mal produce more offsprg than the mothers of heterosexual mal, ” the rearchers wrote. “The fascatg study timat that havg an olr brother creas the odds of beg gay by 38 percent, supportg the ia that a mother’s immune rponse to havg a male child fluenc subsequent boys, ” Universy of Cambridge profsor and statistician David Spiegelhalter told the Daily Mail. Ined, no particular pattern of siblgs, their genr or their age appeared to terme whether a female would be gay.

A new study has disvered a blogil reason for why many men wh elr brothers tend to be gay. Rearchers had prevly noticed a rrelatn between havg olr male siblgs and homosexualy but now, scientists at the Brock Universy Canada have managed to trace to time spent the womb. "Gay men have, on average, a greater number of olr brothers than do heterosexual men, a well-known fdg wh sexual science.

DO HAVG OLR BROTHERS INCREASE MEN’S CHANC OF BEG GAY? HERE’S WHAT THE STUDI SAY

The antibodi, if enter the bra of the send male fet, may alter bra stctur unrlyg sexual orientatn and may fluence relative sexual/romantic attractn to others of a particular rearchers studied plasma om mothers of sons, about half of whom had a gay son, and pared their fdgs wh sampl om women wh no sons and men. The sampl were analysed for male prote-specific antibodi and was found to be higher gay men wh olr brothers.

"Given that the prote is known to be important synapse formatn, you n see how maternal antibodi might affect the wirg of the foetal bra, and that might expla why each subsequent son is more likely to grow up gay. Bogaert's team based their work on the "aternal birth orr effect", however, other studi have not been able to fd a lk between elr brothers and their gay younger siblgs.